Tourist FL

Tourist FL, given by Pierre, who brought it on November 23, 2016.

The tourist FL is an accessory that screws at the back of the M42 screwmount lenses, to transform them into telescopes.
Made by LZOS, the notice (which I do not have but could consult on the Net) gives magnification and field angle for the lenses... made by LZOS!
MTO-11: magnigication 111x, field 20'
ZM-5A: magnigication 55x, field 40'
Jupiter-9: magnigication 10x, field 4,4°
Industar-61 L/Z: magnigication 6x, field 6,6°

For the other lenses, the magnification is given by the formula G=f'ob/f'oc , where f'ob is the focal length of the lens used and f'oc the focal lens of the eyepiece, i.e. 8,9mm.

The tourist FL is well at ease in its case: it can hold in it with an Helios 44-2 (or -3). But not with an Helios 44M (too wide), nor with an Industar-61 L / Z (too long).